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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Alex Vikman


PIRSA:15040106  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Uncertainty Relations, Classicalization and Superluminal propagation
Speaker(s): Alex Vikman
Abstract:
Date: 10/04/2015 - 11:00 am

PIRSA:12030103  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
G-Bounce
Speaker(s): Alexander Vikman
Abstract: I will discuss a wide class of models which realise a bounce in a spatially flat Friedmann universe in standard General Relativity. The key ingredient is a noncanonical, minimally coupled scalar fieldbelonging to the class of theories with Kinetic Gravity Braiding/Galileon-like self-couplings. In th... read more
Date: 19/03/2012 - 2:00 pm

PIRSA:11030110  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Imperfect Dark Energy of Kinetic Gravity Braiding
Speaker(s): Alex Vikman
Abstract: In this talk I will discuss a new class of cosmological scalar fields. Similarly to gravity, these theories are described by actions linearly depending on second derivatives. The latter can not be excluded without breaking the generally covariant formulation of the action principle. Despite the pres... read more
Date: 03/03/2011 - 11:00 am

PIRSA:07090029  ( MP4 Medium Res , MP3 , PDF ) Which Format?
K-Essence, superluminal propagation, causality and emergent geometry
Speaker(s): Alex Vikman
Abstract: The k-essence theories admit the superluminal propagation of the perturbations on classical nontrivial backgrounds. In this talk I will review our arguments from arXiv:0708.0561v1 and show that in spite of the superluminal propagation the causal paradoxes do not arise in these theories and in this r... read more
Date: 14/09/2007 - 10:00 am

PIRSA:06120022  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Superluminal - scalar fields and cosmology
Speaker(s): Alex Vikman
Abstract:
Date: 05/12/2006 - 11:30 am
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